OLED Substrate Auxiliary Electrode via Conductive Liquid Capsule

Solution Overview

Problem

In top-emission OLED displays, the first electrode's high resistance due to its thinness leads to non-uniform voltage distribution and increased power consumption, causing non-uniform light emission.

Innovation Solution

An auxiliary electrode with lower resistance is connected to the first electrode through a conductive liquid connection electrode, which is formed by encapsulating a conductive liquid in a capsule structure that expands to break and flow onto the auxiliary electrode, ensuring reliable contact and reducing production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the first electrode is made thinner to increase light transmittance, then the light transmittance rate is improved, but the resistance increases causing voltage drop and non-uniform light emission

Engineering Contradiction:

Improvelight transmittance rateVSAvoidvoltage distribution uniformity

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The first electrode system is segmented into two parts: a thin first electrode for light emission and an auxiliary electrode with lower resistance for electrical connection. This segmentation allows each part to optimize its function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A conductive liquid is introduced as an intermediary substance to connect the first electrode and the auxiliary electrode. The conductive liquid fills the capsule structure and provides a low-resistance electrical pathway, mediating between the thin first electrode and the auxiliary electrode.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If the first electrode is made thinner to increase light transmittance, then the light transmittance rate is improved, but power consumption increases

Engineering Contradiction:

Improvelight transmittance rateVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The first electrode system is segmented into two parts: a thin first electrode for light emission and an auxiliary electrode with lower resistance for electrical connection. This segmentation allows each part to optimize its function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A conductive liquid is introduced as an intermediary substance to connect the first electrode and the auxiliary electrode. The conductive liquid fills the capsule structure and provides a low-resistance electrical pathway, mediating between the thin first electrode and the auxiliary electrode.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If an auxiliary electrode is added to reduce resistance, then voltage distribution uniformity is improved, but device complexity increases

Engineering Contradiction:

Improvevoltage distribution uniformityVSAvoidelectrode structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The capsule structure serves multiple functions: it acts as a mold for positioning the conductive liquid, provides a encapsulation barrier, and creates the connection pathway between electrodes. This multi-functionality reduces the need for additional separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The conductive liquid automatically flows and distributes itself within the capsule structure, forming the connection electrode without requiring additional alignment or positioning steps. The system uses its own materials and geometry to achieve proper connection.

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution improves the uniformity of light emission and reduces power consumption by minimizing voltage drop across the first electrode, while simplifying the manufacturing process and avoiding pixel defects.

Implementation Method 1

expanding the capsule structure to be broken so as to enable the conductive liquid to form a connection electrode

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS10991902B2Organic light emitting diode substrate and preparation method thereof, and display panel

Publication Date: 2021.04.27 BOE TECHNOLOGY GROUP CO LTD

AI summary

There provide an organic light emitting diode substrate and preparation method thereof and a display panel. The preparation method includes: forming a pixel defining layer which defines a pixel region and has a via hole on a base; forming an auxiliary electrode in the via hole; forming a capsule structure encapsulating a conductive liquid on the auxiliary electrode; expanding the capsule structure to be broken so as to enable the conductive liquid to form a connection electrode; and forming a first electrode covering the base, the first electrode being connected to the auxiliary electrode through the connection electrode. In the present disclosure, the connection electrode is formed through the capsule structure encapsulating the conductive liquid, so that the first electrode is connected to the auxiliary electrode through the connection electrode. The preparation process is simpler and the production cost is lower.